nv50/ir: Add fallthrough statement.

Fix defect reported by Coverity Scan.

Missing break in switch (MISSING_BREAK)
unterminated_case: The case for value
nir_intrinsic_bindless_image_samples is not terminated by a 'break'
statement.

Suggested-by: Karol Herbst <kherbst@redhat.com>
Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6645>
diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_from_nir.cpp b/src/gallium/drivers/nouveau/codegen/nv50_ir_from_nir.cpp
index b9a82a0..393b88a 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_from_nir.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_from_nir.cpp
@@ -2220,6 +2220,7 @@
          break;
       case nir_intrinsic_bindless_image_samples:
          mask = 0x8;
+         /* fallthrough */
       case nir_intrinsic_image_samples:
          ty = TYPE_U32;
          bindless = op == nir_intrinsic_bindless_image_samples;